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NXP Semiconductors
PCA9634
8-bit Fm+ I 2 C-bus LED driver
9. Bus transactions
slave address
control register
data for register D[4:0] (1)
S A6 A5 A4 A3 A2 A1 A0 0
A
X
X
X D4 D3 D2 D1 D0 A
A
P
START condition
R/W
Auto-Increment options
Auto-Increment flag
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
STOP
condition
002aac141
(1) See Table 4 for register de?nition.
Fig 13. Write to a speci?c register
slave address
control register
MODE1 register
MODE2 register
S A6 A5 A4 A3 A2 A1 A0 0
A
1
0
0
0
0
0
0
0
A
A
A
(cont.)
START condition
R/W
acknowledge
Auto-Increment
on all registers
MODE1
register
selection
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
from slave
SUBADR3 register
Auto-Increment on
ALLCALLADR register
(cont.)
A
acknowledge
from slave
A
acknowledge
from slave
P
STOP
condition
Fig 14. Write to all registers using the Auto-Increment feature
002aac142
slave address
control register
PWM0 register
PWM1 register
S A6 A5 A4 A3 A2 A1 A0 0
A
1
0
1
0
0
0
1
0
A
A
A
(cont.)
START condition
R/W
acknowledge
from slave
increment
on Individual
brightness
registers only
PWM0
register
selection
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
Auto-Increment on
PWM6 register
PWM7 register
PWM0 register
PWMx register
(cont.)
A
acknowledge
from slave
A
acknowledge
from slave
A
acknowledge
from slave
A
acknowledge
from slave
P
STOP
condition
002aac143
Fig 15. Multiple writes to Individual Brightness registers only using the Auto-Increment feature
PCA9634_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
22 of 38
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